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Assume that refcnt of shared root is non-negative

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The refcnt of a shared root array should always be non-negative.
This commit is contained in:
Peter Zhu 2022-03-14 09:44:50 -04:00
parent 45786667ec
commit 412991268f
1 changed files with 5 additions and 7 deletions
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12
array.c
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@ -165,6 +165,7 @@ should_not_be_shared_and_embedded(VALUE ary)
#define ARY_SHARED_ROOT_OCCUPIED(ary) (ARY_SHARED_ROOT_REFCNT(ary) == 1)
#define ARY_SET_SHARED_ROOT_REFCNT(ary, value) do { \
assert(ARY_SHARED_ROOT_P(ary)); \
assert((value) >= 0); \
RARRAY(ary)->as.heap.aux.capa = (value); \
} while (0)
#define FL_SET_SHARED_ROOT(ary) do { \
@ -512,10 +513,8 @@ ary_double_capa(VALUE ary, long min)
static void
rb_ary_decrement_share(VALUE shared_root)
{
long num = ARY_SHARED_ROOT_REFCNT(shared_root) - 1;
if (num > 0) {
ARY_SET_SHARED_ROOT_REFCNT(shared_root, num);
}
long num = ARY_SHARED_ROOT_REFCNT(shared_root);
ARY_SET_SHARED_ROOT_REFCNT(shared_root, num - 1);
}
static void
@ -544,9 +543,8 @@ static VALUE
rb_ary_increment_share(VALUE shared_root)
{
long num = ARY_SHARED_ROOT_REFCNT(shared_root);
if (num >= 0) {
ARY_SET_SHARED_ROOT_REFCNT(shared_root, num + 1);
}
assert(num >= 0);
ARY_SET_SHARED_ROOT_REFCNT(shared_root, num + 1);
return shared_root;
}